摘要
制备了壳聚糖包埋Ru(bpy) 2 + 3 /SiO2 复合膜电极 .对其电化学发光特性的研究表明 :铂和玻碳复合膜电极循环伏安曲线的阳极峰分别在 115 0和 1370mV ,阴极峰分别在 10 5 0和12 6 0mV ;复合膜电极的荧光发射光谱位于 5 85nm ;电极的响应时间为 10s,对基质具有电位和 pH选择性 ;对 5 .5× 10 -4 1.0× 10 -2 mol·L-1的草酸和抗坏血酸分别有相关系数为 0 .995和0 .992的线性响应 ,S/N =3时的检测限分别为 5 .0× 10 -5和 6 .4× 10 -5mol·L-1,5次测量的相对标准偏差分别为 3.9%和 6 .8% ;铂和玻碳复合膜电极通常使用时间分别可达 30和 17d以上 .
The electrode coated with chitosan encapsulated Ru(bpy) 2+ 3/silica gel membrane has been prepared by sol gel method and its electrochemiluminescent (ECL) characteristics have been investigated. The cyclic voltammograms of the coated Pt and glassy carbon electrode show their anodic peak potentials at 1 150 and 1 370 mV, cathodic peak potentials at 1 050 and 1 260 mV, respectively. The surface of the coated electrode yields a fluorescence spectrum with a maximum band of 585 nm. The coated electrode has the selectivities of potential and pH for the substrates. The ECL response time of the coated electrode is 10 s after a suitable potential is applied. The correlation coefficients of ECL response to oxalic acid and ascorbic acid are 0.995 and 0.992 in the concentration range of 5.5×10 -4 to 1.0×10 -2 mol·L -1 with the detection limit of 5.0×10 -5 and 6.4×10 -5 mol·L -1 , the RSD is within 3.9% and 6.8% when n =5, respectively. The coated Pt and glassy carbon electrodes may continue to be used for 30 and 17 days respectively before the ECL response decreases to 80% of the initial value.
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2000年第5期550-553,共4页
Journal of Dalian University of Technology
基金
国家教育部留学回国人员科研启动基金!资助项目 ( 1998 679)
关键词
电致化学发光
修饰电极
壳聚糖
electrochemiluminescence
sol gel method
modified electrode/tris(2,2′ bipyridine)ruthenium
chitosan
